My sisters Golden Retriever is only fifthteen weeks old but i feel is looking a little on the thin side. The puppy came from a large litter (9) and mother was taken away from pups at three weeks (day time only).  could this be why the pup has not put on much weight although he does seem to be growing taller which is a nice sign. Could somebody please give me some advice on how she can get some weight or puppy fat on him. thankyou visitor.

How often has he been wormed? How many times a day is he being fed? What is he being fed on?